Boiler circulator



July 28, 1931.

Filed Aug.

A. M NAB BOILER CIRCULATOR 2 Sheets-Sheet l 0 136% JJ Fly. 1

%OOOOOOOOOOOOO OOOOOOOOOOGO I Z n INVENTOR. ALEXANDER MC/VAB ATTORNEY July 28, 1931. MC 1,816,335

BOILER C IRCULATOR Filed Aug. 13,1930 2 Sheets-Sheet 2 24 1 {9' Z5 Z3 Z2 Z3 4 O O O O Z0 4 Z2 0 0 0 o o 0 o /6 O O O O 4 INVENTOR. O o o AL EXANDER Mo/Ws BY I . Z6 Z5 I ATTORNEY Patented July 28, 1931 UNITED STATES i PATENT OFFICE ALEXANDER McNAB, OF BRIDGEPORT, CONNECTICUT BOILER- cmoULATon- Application filed August 13, 1930. Serial No. 474,923.

water in a boiler will be compelled to travel in a certain path or in certain paths, resulting in the water throughout the boiler having a substantially constant temperature and further resulting in all of. the water in the boiler being in circulation preventing the formation of scale.

A further object of the invention is to provide a circulator of simple construction and which may be easily and quickly installed in a boiler and which may be easily and quickly released for movement along the boiler tubes to permit of inspection and repair, the operating position of the circulator being at the ends ofthe tubes adjacent the front wall of the combustion chamber,'

Other objects and advantages will become 5 apparent from a consideration of the following, detailed description taken in connection with the accompanying drawings showing one embodiment of the invention. How ever, it is to be understood that the invention is not limited to the details shown and described since changes in the construction and arrangement of parts may be madewithout departing from the spirit of the invention or the scopeof the appended claims. I

In the drawings V f Figure 1" is a section on the line 1-1 of Fig.2;

Fig. 2 is a section on the line 22of Fig. 1;

Fig. 3 is an enlarged detail view showing the veins and the deflector nozzles at the top of the fire tubes, the side plates being shown in place,

Fig. 4 is a similar view taken at the bottom of the fire tubes; Fig. 5 is a top plan view of the parts shown in Fig. 4; and p liig. 6 is a; erspective view of the circulater detached? v as stated project above the fire tubes, there Referring in detail to the drawings, at 10 is shown the boilershell or casing within whichis enclosed a plurality of fire boxes or chambers 11 and a plurality of sets or series of fire tubes 12, 13, 14 and 15 there being one series of fire tubesfor each .fire box 11. Rearwardly within the shell or casing 10 is the combustion chamber 16 connected with .the fire boxes and the tubes of the various sets or series. I

My improved circulator is applied to the fire tubes and the circulator is exactly the same as applied to sets of tubes 12 and 15 but is somewhat enlarged as appliedto tubes 13 and 14 since but one circulator is applied to both sets of tubes. 7

' As applied to the sets of tubes 12 and 15, the circulator includes a pair of vertically disposedv plat-es 17 and 18, one being arranged at each of the outer sides of the sets of tubes and the plates extending above and below the tubes and at their lower ends curving outwardly as at 19 receiving the upper portions of the fire boxes between them. The plates 17 and 18 are not of very great width but, extend forwardly along the outer. sides of the fire tubes from the front wall of the combustion chamber.v

tween the upper ends of the plates, which 5 are secured transverse plates 22 and 23, the

plates 22 and 23 beingbolted, riveted or otherwise secured to the upper ends of the plates 17 and 18..

As clearly shownthe transverse plates or vanes 22 are of less height than the vanes or blades 23 and the blades 23 include forwardly projecting horizontal portions 24. The space 25 betweenthe horizontal portions 24, constitutes a nozzle, and owing to the position of the plate 22 beneath the lowermost horizontal portion 24, a nozzle'will be formed beneath such portion. This nozzle arrangement is such that heated water rising or boiling up through the fire tubes is directed or deflected forwardly toward the front of the boiler.

Beneath the fire tubes and secured to the side plates 17 and 18 there are deflecting 5 blades or vanes 26, the same being secured to the side plates by having their end portions bent over and bolted, riveted or otherwise secured to the side plates. These lower blades 26 are shown as four in number the same as the upper blades, but it willbe understood that the number nay bevaried. Attention is called to the fact that the lower blades adjacent the combustion chamber are arranged somewhat more close together than 5 are the blades remote from the combustion chamber.

The circulator for the two central sets of tubes 13 and M is much the same as the circulators .for the sets of tubes 12 and 15.

This larger circulator includes side plates 27 and 28 similar to. the plates17 and 18 except .that they are somcwhat'longer since more .tubesare used and these plates 27 and 28 at theirlower endscurve outwardly as at 29 so as toinclude the upper portions of two fire boxes between them. The plates are securedto the firetubes as by hooked bolts 20 and nuts 21 andat their upper ends carry ;the plates 22 and 23, the plateslbeing the same as th'ecorresponding plates previously described in. connection with the circulators for the sets of tubes 12.and.15. Between the ,lower ,ends of the plates27 and 28 are se cured the transverse plates or vanes 26.

i A curvedldefiector plate 30 extends across the boiler in the rear of the combustion chamber 16 and is secured to the boiler as ;by rivets 31 andto the braces 32 of the boiler .as byhooked bolts At the front of the boiler is a deflector 3% similar tothe deflector 30 and resting at its lower edge on the upperfiretubeswhile at its upper edge it'is secured to the braces 32 as bymeans of hookedbolts 35.

While it; is believed that the operation will be apparent it is desired to point out that water ascending due to heattransmitted to it from the fire chambers or boxes will be the hottest adjacent the combustion chamber 16 and that as the water rises owing to; being heated it will engage the plates 26 and be deflected rearwardly into engagement with the front wall of the combustion chamber.

.It'iswell known that. the combustion chamber tube plate is directly exposed to the fullforce of the flame and gases in the combustion chamber, and is, therefore, one of the hottest surfaces in the boiler. However, owing to the necessity ofhaving to install the tube plate in a vertical position, within the boiler, it cannot be considered aheating surface, for the reason that all steam containing bubbles following the line of least resistance ascend directly against this overheated tube plate insulating it from direct the tubes.

reaching the top ofthefire tubes the water engages the plates 22 and 28 and is deflected forwardly whereby it is prevented from bubbling up into the steam space and resulting in wet steam. Thewajter being dlrected forwardly by the nozzles will descend at the forward portion of the boiler as other water 15 ascending rearwardly 1n the boller whereby continuous circulation is set up.

' It'will be notedthat side plates 17, 18 or 27 28 will confine the water as it moves upwardly fromthe fire chambers and prevent it from spreading laterally through In other words once the water enters .between the plates, having passed through the vanes 26 it cannot escape laterally through the tubes or between the tubes but must move upwardly and pass out between the plates or vanes 22 and 23. hus a definite channel for the water to pass through is created. water passes outwardly through the upper vanes 22, 28 it will create a circulation through the passageways or spacesbetween or at the sides of the plates. For example, the waterbeing directed forwardly by the nozzleswill draw water upwardlylthrough the space between the plates 18 and 27 and the space between the plates 28 and 17.

Having thus described my invention, what is claimed is:

1. In aboiler circulator, a pair of spaced side plates extending above the fire tubes of the boiler, and blades extending between and rigidly connected at their ends to-the extending portions of the side plates above the fire tubes, said blades inclining forwardly of the boiler.

'2. In a boiler circulator for ahorizontal fire tube boiler, a pair of vertically disposed plates arranged one at each side of the fire tubes and extending above the fire tubes, and blades supported between the extending end portions of the side plates above the fire tubes, said blades inclining forwardly ofthe boiler.

In a boiler circulator for a horizontal fire tube: boiler, a pair of vertically disposed plates arranged oneat each side of the fire tubes adjacent the combustion chambertube Further, as the plate, said vertical side plates extending I above the fire tubes, and a blade rigidly secured at one end of the upper extending portion of one of said plates and projecting in the direction of the extendingportion I of the other of said plates and across said tubes, said blade incllning forwardly of the boiler.

4.. In a boiler circulator for a horizontal fire tube boiler, a pair of spaced side plates extending above the fire tubes of the boiler, and blades supported between the end portions of the plates above the fire tubes, said blades formed at their upper portions into horizontally extending nozzles.

5. In a boiler circulator, a pair of spaced side plates extending below the fire tubes of the boiler, and a series of blades supported between the end portions of the side plates below the fire tubes, said blades inclining rearwardly of the boiler.

6. In a boiler circulator, a pair of spaced side plates extending below the fire tubes. of the boiler, said plates at their lower ends curving away from each other whereby their lower end portions are disposed laterally of the boiler fire box, and a series of blades supported between the end portions of the side plates below the fire tubes and above the fire box.

7. In a boiler circulator, a pair of spaced side plates extending above and below the fire tubes of the boiler, and two series of spaced water deflecting blades arranged respectively above and below the fire tubes and between the end portions of the plates.

8. In a boiler circulator, a pair of spaced side plates extending above and below the fire tubes of the boiler, and two series of spaced Water deflecting blades arranged respectively above and below the fire tubes and between the end portions of the plates, some of said blades above the fire tubes including horizontally extending portions forming a nozzle.

9. In a boiler circulator for a horizontal fire tube boiler, a pair of spaced plates arranged one at each side of a set of boiler tubes, said plates extending above the tubes of said set, and blades supported between the end portions of the plates above the fire tubes, said blades inclining forwardly of the boiler.

Signed at Bridgeport, in the county of 59 Fairfield, and State of Connecticut, this 30th day of July A. D. 1930.

ALEXANDER MoNAB. 

